Sidewall portion of an automobile tire



FIG. 1 is a front view of a sidewall portion of an automobile tire;

FIG. 2 is a perspective view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a fragmentary enlarged view showing the details of the sidewall portion surrounded by the cross-sections A and B in FIG. 1.

Broken lines in the drawing figures are used to show environmental structure only, and form no part of the claimed design. 

The ornamental design for a sidewall portion of an automobile tire, as shown and described. 